The mass titration method for determination of the zero point of charge (PZC) was proposed by Noh and Schwarz (J. Colloid Interface Sci. 130, 157 (1989)). This method was developed for (hydr)oxides and is limited to pure samples. It is based on the fact that pH approaches the limiting value (pH∞) by addition of solid powder to an aqueous medium. The limiting pH∞ value, at a high solid content, is then equal to pHpzc. This article is an extension of the original work and concerns the samples contaminated with an acid or base which are not irreversibly bound
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